發(fā)布時(shí)間：2019-03-04 14:31

【摘要】：近十年來(lái),我國(guó)的互聯(lián)網(wǎng)行業(yè)發(fā)展迅猛。面對(duì)如此龐大的網(wǎng)絡(luò)數(shù)據(jù)流量,和各種各樣的新型網(wǎng)絡(luò)業(yè)務(wù)應(yīng)用,傳統(tǒng)的以TCP/IP為核心的網(wǎng)絡(luò)架構(gòu)越來(lái)越表現(xiàn)出其擴(kuò)展復(fù)雜和難以維護(hù)等各種劣勢(shì),這也促使著人們對(duì)新一代網(wǎng)絡(luò)架構(gòu)的研究。正如手機(jī)應(yīng)用開(kāi)發(fā)興起,人們想要將未來(lái)網(wǎng)絡(luò)改造成能像手機(jī)應(yīng)用一樣自由實(shí)現(xiàn)各種功能的軟件模式,于是SDN(Software Defined Networking)的思想產(chǎn)生了。在SDN的概念中,關(guān)鍵思想是網(wǎng)絡(luò)數(shù)據(jù)的控制和轉(zhuǎn)發(fā)分離。而另一方面,隨著互聯(lián)網(wǎng)的廣泛應(yīng)用,加之移動(dòng)網(wǎng)絡(luò)、物聯(lián)網(wǎng)、大數(shù)據(jù)和云計(jì)算等新網(wǎng)絡(luò)技術(shù)的產(chǎn)生和發(fā)展,為了處理如此海量規(guī)模的數(shù)據(jù),數(shù)據(jù)中心應(yīng)運(yùn)而生。數(shù)據(jù)中心一般是由一個(gè)研究機(jī)構(gòu)、單位或企業(yè)搭建并集中控制管理,跟SDN集中控制的思想幾乎完全契合,因此SDN在當(dāng)前環(huán)境下最主要的應(yīng)用場(chǎng)景或者說(shuō)現(xiàn)實(shí)應(yīng)用需求都在數(shù)據(jù)中心。數(shù)據(jù)中心的核心價(jià)值就是可以將成千上萬(wàn)的數(shù)據(jù)集中處理,所以對(duì)網(wǎng)絡(luò)的性能要求極高,這對(duì)數(shù)據(jù)中心內(nèi)部的流量負(fù)載均衡提出了嚴(yán)格要求。本文的目的是研究如何在SDN數(shù)據(jù)中心實(shí)現(xiàn)鏈路負(fù)載均衡。本文針對(duì)SDN數(shù)據(jù)中心網(wǎng)絡(luò)東西向流量的穩(wěn)定性,提出了基于流量探測(cè)的動(dòng)態(tài)負(fù)載均衡算法,簡(jiǎn)稱(chēng)為DLB(Dynamic load balance)算法。該方法的基本思想是根據(jù)探測(cè)流的變化情況,把流分為穩(wěn)定流和非穩(wěn)定流。對(duì)于非穩(wěn)定流,采用ECMP(equal cost multipath)算法進(jìn)行轉(zhuǎn)發(fā);對(duì)于穩(wěn)定流,使用DLB算法中的流路由算法來(lái)找到一條最優(yōu)固定路徑來(lái)快速穩(wěn)定地轉(zhuǎn)發(fā),當(dāng)鏈路開(kāi)始阻塞時(shí),流路由算法會(huì)對(duì)較大的穩(wěn)定流進(jìn)行源端虛擬機(jī)遷移,以達(dá)到避免穩(wěn)定流過(guò)于集中化,均衡數(shù)據(jù)中心網(wǎng)絡(luò)負(fù)載的目的。同時(shí),為了測(cè)試DLB算法的性能,我們?cè)O(shè)計(jì)并搭建了SDN的數(shù)據(jù)中心實(shí)驗(yàn)平臺(tái),并在平臺(tái)上實(shí)現(xiàn)了負(fù)載均衡應(yīng)用來(lái)測(cè)試算法性能。通過(guò)跟其他算法的對(duì)比測(cè)試,實(shí)驗(yàn)結(jié)果表明,在網(wǎng)絡(luò)中穩(wěn)定流比例越高時(shí),同等吞吐量下DLB算法能達(dá)到比ECMP和其他對(duì)比算法更好的優(yōu)化性能。
[Abstract]:In recent ten years, the Internet industry of our country develops rapidly. In the face of such a huge network data flow, and a variety of new network business applications, the traditional network architecture with TCP/IP as the core shows more and more disadvantages such as complexity of expansion and difficulty to maintain. This also prompted people to study the new generation network architecture. Just as mobile application development has sprung up, people want to transform the future network into a software model that can perform all kinds of functions as freely as mobile applications, so the idea of SDN (Software Defined Networking) has come into being. In the concept of SDN, the key idea is the separation of network data control and forwarding. On the other hand, with the wide application of the Internet, together with the emergence and development of new network technologies, such as mobile network, Internet of things, big data and cloud computing, data center emerges as the times require in order to deal with such large-scale data. A data center is typically built by a research institution, unit, or enterprise and centrally controlled and managed, almost entirely in line with the idea of SDN centralized control. Therefore, the most important application scenarios or real application requirements of SDN in the current environment are in the data center. The core value of the data center is that it can process thousands of data centrally, so the performance of the network is very high, which puts forward strict requirements for the load balancing of traffic in the data center. The purpose of this paper is to study how to achieve link load balancing in SDN data center. Aiming at the stability of east-west traffic in SDN data center network, a dynamic load balancing algorithm based on traffic detection is proposed in this paper, which is called DLB (Dynamic load balance) algorithm for short. The basic idea of this method is to divide the flow into steady flow and unsteady flow according to the change of probe flow. The ECMP (equal cost multipath) algorithm is used to forward the unsteady flow. For stable flow, the flow routing algorithm of DLB algorithm is used to find an optimal fixed path for fast and stable forwarding. When the link starts to block, the flow routing algorithm will migrate the source-end virtual machine to the larger stable flow. In order to avoid over-centralization of steady flow and balance the load of data center network. At the same time, in order to test the performance of DLB algorithm, we design and build the data center experimental platform of SDN, and implement the load balancing application to test the performance of the algorithm on the platform. Compared with other algorithms, the experimental results show that the higher the proportion of steady flow in the network, the better the performance of DLB algorithm under the same throughput than that of ECMP and other algorithms.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TP308

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